Rear bush problems mk4

Hello I have a 2015 ND 30k and developed the rear rattle, took to a mazda garage, telling me I need a new hub at £750, my car was bought from an independent garage so doesn't have a full mazda service history so I reckon a good will offer from mazda is unlikely. The mazda garage did offer to fit replacement bushes though if I could source them. Poly bush seem to have developed a set specifically for this purpose but can find anyone on any forum who has tried them and any forum discussion on fitting poly bushes seems to warn against due to a harsh ride. These bushes are blue as oppose to their standard orange though and marked as comfort ride though which makes me think they have taken a non race track approach to these particular bushes although they say they have been tested by a race team. Any thoughts out there on whether I should give them a shot?

Yes the replacements supplied by polybush have spherical bearings and are designed specifically to address this issue but I can't find anyone who has tried to fit them. I am wishing I had done more homework before I purchased as ask anyone about the mx5 and they all say its a reliable car but obviously not the mk4.